@keyframes watermark {
  0% {
    background-position: 0 0;
  }
  25% {
    background-position: 100% 100%;
  }
  50% {
    background-position: 0 0;
  }
  75% {
    background-position: 100% -100%;
  }
  100% {
    background-position: 0 0;
  }
}
